IMPORTANT NOTE: The problem with the structure in the bias is not completely solved. It has a much lower amplitude than what was seen in images of Nov 25 but it varies with time, it can be different from one bias frame to the next. On science frames during the night, there is virtually nothing to be seen, maybe science data are fine after all.

OBSERVATIONS: start regularly at sunset. Sunset at UT23:36, start of night at UT01:01